Perpendicular magnetic recording medium
US4923763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1988 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Sep 19, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There are disclosed a perpendicular magnetic recording medium comprising a substrate of a polymer film containing 0.7% by weight or less of a residual solvent and a ferromagnetic alloy layer formed on the substrate and a method for preparing the same comprising the steps of heating a substrate composed of a polymer film containing a residual solvent in order to regulate a content of the solvent existing in the substrate to 0.7% by weight or less; and afterward forming a magnetic layer composed of a ferromagnetic alloy on the substrate. The perpendicular magnetic recording medium of the present invention has a prolonged durability and heightened reliability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.